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fix(compiler): fix utf8encode, move to sharted utils, add tests (#15076)

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This commit is contained in:
Victor Berchet
2017-03-14 17:13:39 -07:00
committed by Chuck Jazdzewski
parent 3b1956bbf2
commit 959a03a61f
4 changed files with 77 additions and 48 deletions
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32
packages/compiler/src/util.ts
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@ -98,3 +98,35 @@ const STRING_MAP_PROTO = Object.getPrototypeOf({});
function isStrictStringMap(obj: any): boolean {
return typeof obj === 'object' && obj !== null && Object.getPrototypeOf(obj) === STRING_MAP_PROTO;
}
export function utf8Encode(str: string): string {
let encoded = '';
for (let index = 0; index < str.length; index++) {
let codePoint = str.charCodeAt(index);
// decode surrogate
// see https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
if (codePoint >= 0xd800 && codePoint <= 0xdbff && str.length > (index + 1)) {
const low = str.charCodeAt(index + 1);
if (low >= 0xdc00 && low <= 0xdfff) {
index++;
codePoint = ((codePoint - 0xd800) << 10) + low - 0xdc00 + 0x10000;
}
}
if (codePoint <= 0x7f) {
encoded += String.fromCharCode(codePoint);
} else if (codePoint <= 0x7ff) {
encoded += String.fromCharCode(((codePoint >> 6) & 0x1F) | 0xc0, (codePoint & 0x3f) | 0x80);
} else if (codePoint <= 0xffff) {
encoded += String.fromCharCode(
(codePoint >> 12) | 0xe0, ((codePoint >> 6) & 0x3f) | 0x80, (codePoint & 0x3f) | 0x80);
} else if (codePoint <= 0x1fffff) {
encoded += String.fromCharCode(
((codePoint >> 18) & 0x07) | 0xf0, ((codePoint >> 12) & 0x3f) | 0x80,
((codePoint >> 6) & 0x3f) | 0x80, (codePoint & 0x3f) | 0x80);
}
}
return encoded;
}